Pool Care Blog
Houston Pollen Season and Your Pool: What to Know
Seasonal · March 2026 · 5 min read
If you live in Greater Houston, you've noticed: during pollen season, everything turns yellow. Your car, your patio, your roof — and your pool. While your pool doesn't sneeze, it suffers in other ways. Pollen doesn't just look bad; it creates chemical imbalances that trigger algae growth, clogs your filter, and turns crystal clear water murky in days.
Here's what happens and exactly what to do about it.
Houston's Pollen Calendar
Houston has two major pollen seasons — and they overlap dangerously.
Oak Pollen (Late January through April)
Severity: Heavy
The worst offender. Oak pollen is fine and sticky — it settles on water and clogs filters faster than other types. Peak severity usually hits February through early March.
Pine Pollen (March through May)
Severity: Very Heavy (peak March-April)
Pine pollen is even finer than oak. During late March and April, the pollen count in the Houston area reaches its peak. Mix oak and pine together and your filter is under siege.
Grass Pollen (April through October)
Severity: Moderate (seasonally)
Less problematic than oak/pine but still a factor. Comes in waves as different grasses bloom.
How Pollen Damages Your Pool Chemistry
Pollen isn't just cosmetic. It creates a chain reaction in your water.
Clogs your filter
Pollen particles accumulate faster than normal. A filter that normally lasts 4–6 weeks between cleanings may need cleaning every 1–2 weeks during peak season.
Adds phosphates
Pollen decays in your water, releasing phosphates — algae's favorite food source. You could have normal chlorine and pH but still develop algae because phosphate levels spike.
Reduces water clarity
Even if algae hasn't bloomed, suspended pollen makes water look cloudy or slightly yellow. It's not algae — it's pollen particles catching light.
Triggers bacteria growth
Organic matter (pollen) plus warm Houston water (70–85°F during pollen season) creates ideal conditions for bacteria and algae to explode.
Pollen Season Pool Care: The Action Plan
1. Increase Skimming Frequency
During peak pollen season (late Feb–April), skim your pool daily if possible. Pollen floats on the surface. Removing it before it sinks and decays prevents phosphate buildup and filter clogging.
2. Clean or Backwash Your Filter More Often
Check your filter's pressure gauge weekly during pollen season. Once it rises 5–8 psi above the normal baseline, clean (cartridge) or backwash (sand) immediately. You may need to clean 2–3 times per week instead of once per week.
3. Test and Lower Phosphate Levels
Test phosphate levels weekly during pollen season (even if you don't normally). Keep them below 300 ppb (parts per billion). Use a phosphate remover product if levels spike — it's cheaper than fighting an algae bloom.
4. Maintain Higher Chlorine Levels
Keep chlorine at 3–4 ppm during pollen season instead of the normal 2–3 ppm. The extra chlorine handles the extra organic load from pollen decay.
5. Run Your Pump Longer
Increase pump run time from 8–10 hours daily to 12 hours daily during March–April. Better circulation means better filtration and less pollen settling on the bottom.
Houston pollen season makes pool maintenance twice as intensive. Let Admiral's PHTA-certified technicians handle the weekly cleaning, filter maintenance, and chemistry during pollen peaks.
Book Pollen Season Cleaning →Pollen vs. Algae: How to Tell the Difference
Your water looks yellow or greenish. Is it pollen or algae? The answer changes how you fix it.
Pollen
Appearance: Floating yellow/brown dust visible. Water looks murky but not bright green. You can see the bottom.
How to test: Scoop water into a clear glass. If suspended particles settle to the bottom within a few minutes, it's pollen.
Fix: Skim aggressively, clean filter, and increase chlorine. No special algaecide needed. Water clears within a day.
Green Algae (early)
Appearance: Water turns slightly cloudy green or hazy. Corners look darker green. You can still see the bottom.
How to test: Brush a wall — if it's slimy or fuzzy, it's algae. Pollen on walls brushes off easily.
Fix: Shock treatment, brush all surfaces, and run filter continuously. Takes 3–5 days minimum.
Yellow/Mustard Algae
Appearance: Yellow or tan patches on walls, floor, and shady areas. Looks like sand. Water may stay relatively clear.
How to test: Brush the yellow patches. If they come back quickly in the same spot, it's algae rooted into plaster.
Fix: Requires specialized algaecide and aggressive brushing. Professional treatment recommended.
The Bottom Line
Houston's pollen season is brutal on pools, but predictable. If you prepare in February and stay aggressive through April, you'll avoid green water, expensive chemical corrections, and filter damage. Once the pollen settles in May, water balance becomes much easier again.
Need Professional Pool Help?
Admiral Pool Service has been keeping Greater Houston pools crystal clear since 2019. Licensed, insured, and PHTA certified.
Or call (281) 624-6191.
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